Sounds stupid but have you tried just closing the wallet and reopening it? Mine also gets stuck quite often when I leave it closed for a while... The trick is to close/open the wallet several times until it finally syncs.

Sry if i'm just pointing out super obvious stuff haha. If nothing works you can always try to reinstall windows (but there must be a way around that) Just get a intel pc stick and send your coins there

I'm having an issue updating with Windows 7.

Updating through the wallet appeared to be successful but after the wallet reopens version 2.1.1 is still displayed in the bottom left corner. If you select the Check For Update option under the Help tab it will try to download and install 2.1.6 again.

I retried installing 2.1.6 again but this time I downloaded the file using the download link on the website. The installation process completed once more but with exactly the same result as when installing through the wallet.

I haven't tried a complete uninstall at this point but if others are also having issues I will wait before trying again.

You might need to remove all of the files in the registry...I'm not sure what the best way is to do that but I think there are a few apps that can remove software completely (including all of the registry files)

Other than that I cant think of anything else